Hot-Water Supplying System of Boiler Equipped With Dual Pipe Heat Exchanger

ABSTRACT

Disclosed is a hot water supplying system of a boiler equipped with a double pipe heat exchanger, which can normally perform a heating operation in the boiler having the double pipe heat exchanger, in which an outer pipe used for a hot water pathway and an inner pipe used for a heating water pathway are installed, under a circumstance where water supply is stopped. The hot water supplying system includes: a double pipe heat exchanger including an outer pipe to which combustion heat is directly transferred from a burner of a combustion chamber; a cold water pipe for supplying water to the outer pipe of the heat exchanger; and a hot water supplying pipe through which water is discharged from the outer pipe of the heat exchanger, wherein a backflow cutoff valve and a pressure absorbing device are mounted on the cold water pipe. The hot water supplying system is provided with the backflow cutoff valve and the pressure absorbing device, thereby normally performing an operation of heating rooms under a circumstance where water supply is interrupted.

TECHNICAL FIELD

The present invention relates to a hot water supplying system of a boiler equipped with a double pipe heat exchanger, and more particularly to a hot water supplying system of a boiler equipped with a double pipe heat exchanger, which can normally perform a heating operation in the boiler having the double pipe heat exchanger, in which an outer pipe used for a hot water pathway and an inner pipe used for a heating water pathway are installed, under a circumstance where water supply is interrupted.

BACKGROUND ART

As well known, boilers have been used for heating rooms and supplying hot water at home or in public buildings. Generally, the boilers use a double pipe heat exchanger or a single pipe heat exchanger.

Generally, the double pipe heat exchanger refers to one in which a double pipe with a hot water pathway and a heating water pathway is arranged in a combustion chamber to directly transfer combustion heat. The single pipe heat exchanger refers to one in which a hot water heat exchanger is separated from a combustion chamber to indirectly transfer combustion heat.

FIG. 1 is a view showing a configuration of a conventional hot water supplying system of a boiler equipped with a double pipe heat exchanger in which an outer pipe is used for a hot water pathway.

In the conventional boiler, a burner 20 is disposed at a lower portion of a combustion chamber 10. A heat exchanger 30 is installed at an upper portion of the burner 20. Therefore, heat energy generated from the burner 20 is transferred to the heat exchanger 30 including pipes through which water generally flows.

As shown in FIG. 1 attached hereto, the conventional double pipe heat exchanger includes an outer pipe 31 used for heating water pathway and an inner pipe 32 used for hot water pathway. In the conventional double pipe heat exchanger, combustion heat is firstly transferred from the burner 20 to the outer pipe 31 and then is secondly transferred to the inner pipe 32.

In the conventional boiler having the double pipe heat exchanger, a heating water circulation apparatus has a structure in which an inner pipe 32 of a heat exchanger 30, a heating water supplying pipe 51, a heating water line 50, a first returned water pipe 52, an expansion tank 53, a second returned water pipe 54, a circulation pump 40, and a third circulation pipe 55 are sequentially connected to one another.

During an operation of heating rooms, therefore, the heating water flows by means of a circulation pump 40 in the inner pipe 32 of the heat exchanger 30, and heat energy which is generated in the combustion chamber 20 is transferred to a heating water line 50 by flow of the heating water.

On the other hand, the water supplying system includes a cold water pipe 61 for supplying water to an outer pipe 31 of the heat exchanger, the outer pipe 31 of the heat exchanger 30, and a hot water pipe 61 for discharging heated water from the outer pipe 31, which are sequentially connected to one another.

Therefore, water introduced from a water supplying pipe (not shown) flows to the outer pipe 31 by way of the heat exchanger 30, and hot water of the outer pipe 31 heated by combustion heat in the heat exchanger 30 is discharged to the outside through the hot water pipe 62.

However, when supply of water through the water supplying pipe is temporarily interrupted, water in the outer pipe 31 of the heat exchanger 30 is discharged through the cold water pipe 61. As a result, the heat exchange has a lack of water which is a heat transfer medium between the outer pipe 31 and the inner pipe 32, so that heating rooms is abnormally performed. Further, there is a problem in that the heat exchanger 30 may be overheated and damaged.

DISCLOSURE OF INVENTION Technical Problem

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a hot water supplying system of a boiler equipped with a double pipe heat exchanger, which can normally perform a heating operation in the boiler having the double pipe heat exchanger, in which an outer pipe used for a hot water pathway and an inner pipe used for a heating water pathway are installed, under a circumstance where water supply is interrupted.

Technical Solution

In order to accomplish the object of the present invention, there is provided a hot water supplying system of a boiler, which includes: a double pipe heat exchanger including an outer pipe to which combustion heat is directly transferred from a burner of a combustion chamber; a cold water pipe for supplying water to the outer pipe of the heat exchanger; and a hot water supplying pipe through which water is discharged from the outer pipe of the heat exchanger, wherein a backflow cutoff valve and a pressure absorbing device are mounted on the cold water pipe.

Advantageous Effects

As described above, the hot water supplying system of a boiler equipped with a double pipe heat exchanger according to the present invention includes a backflow cutoff valve and a pressure absorbing device, thereby normally performing an operation of heating rooms under a circumstance where water supply is interrupted and preventing damage of the heat exchanger caused by overheating of the boiler so as to increase a lifetime of the boiler.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

FIG. 1 is a view showing a configuration of a conventional hot water supplying system of a boiler having a double pipe heat exchanger in which an outer pipe for a hot water pathway is installed;

FIG. 2 is a view showing a configuration of a conventional hot water supplying system of a boiler having a double pipe heat exchanger according to an embodiment of the present invention; and

FIG. 3 is a sectional view showing an operation of a backflow cutoff valve and a pressure absorbing device when water supply is normally performed and interrupted.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view showing a configuration of a hot water supplying system of a boiler equipped with a double pipe heat exchanger according to the embodiment of the present invention.

A cold water pipe 61, an outer pipe 31 of an heat exchanger, and a hot water pipe 62 according to the present invention have the same structure as the conventional pipes. Therefore, the detailed description of the pipes will be omitted to avoid a duplicate description. The operation of structural members newly added to the hot water supplying system will be described in detail.

As shown in FIG. 2 attached hereto, the hot water supplying system of the boiler equipped with the double pipe heat exchanger according to the present invention includes a check valve 70 mounted on the cold water pipe 61, and a pressure absorbing device 80 mounted on the cold water pipe 61 between the check valve 70 and the heat exchanger 30.

The check valve 70 allows cold water to flow from a water supplying pipe to the heat exchanger 30 when normally operating so as not to interrupt water supply, as shown in FIG. 3. Further, when water supply is interrupted, the check valve 70 prevents water in the outer pipe 31 of the heat exchanger 30 from being discharged.

The pressure absorbing device 80 does not operate when water supply is normally performed, as shown in FIG. 3. However, the pressure absorbing device 80 functions as a buffer of increased pressure caused by expansion of water in the outer pipe of the heat exchanger, which is heated, in the state where the flow of water is interrupted by means of the check valve 70 when water supply is interrupted.

As shown in FIG. 3, the pressure absorbing device 80 provides a space corresponding to the volume of expanded hot water in order to prevent an increase of the pressure of the heat exchanger due to the check valve 70. As a result, it is possible to prevent damage of the heat exchanger caused by an increase of inner pressure of the heat exchanger.

INDUSTRIAL APPLICABILITY

As described above, the present invention provides a boiler equipped with a double pipe heat exchanger including an inner pipe used for a hot water pathway, which can normally perform an operation of heating rooms under a circumstance where water supply is interrupted.

Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 

1. A hot water supplying system of a boiler, comprising: a double pipe heat exchanger including an outer pipe to which combustion heat is directly transferred from a burner of a combustion chamber; a cold water pipe for supplying water to the outer pipe of the heat exchanger; and a hot water supplying pipe through which water is discharged from the outer pipe of the heat exchanger, wherein a backflow cutoff valve and a pressure absorbing device are mounted on the cold water pipe. 